Formula: Ca(WO4) tungstate
Specific gravity: 5.9 - 6.1
Hardness: 4½ to 5
Colour: Tan, golden-yellow, colourless, white, greenish, dark brown, etc.; colourless in transmitted light May be compositionally colour zoned.
Solubility: Slightly soluble in hydrochloric acid
Common impurities: Mo,Nb,Ta
Plutonic igneous environments
Metamorphic environments (common)
Scheelite is a primary mineral found in
pegmatites and also a secondary
mineral in contact metamorphic deposits and in the oxidation zone of
hypothermal (high temperature) hydrothermal veins in
granitic rocks and in alluvial deposits.
In contact metamorphic environments it may be associated with molybdenite. In hydrothermal veins it is associated with apatite, arsenopyrite, cassiterite, fluorite, topaz and hübnerite-ferberite.
At Trumbull, Fairfield county, Connecticut, USA, wulfenite pseudomorphs after scheelite have been found (KL p217).
At Long Hill, Haddam, Middlesex county, Connecticut, USA, ferberite pseudomorphs after scheelite have been found (KL p215).
At the Gold Hill District, Deep Creek Mountains, Tooele county, Utah, USA, cuprotungstite pseudomorphs after scheelite have been found (KL p218).
Scheelite may form as an alteration product of ferberite (AJM 18.2.26).
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